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Tell us what is happening.Flat roof slope and drainageFlat roof inspection and maintenanceCommercial roofing planned around your operationsElastomeric membrane for flat roofsTar and gravel roofingFlat roof insulation and vapour controlRoof flashing, parapets and connectionsRoof drain maintenance and water drainageFlat roofing in MontrealRoofer in Laval: flat roofs and repairsFlat roofing on the South ShoreFlat and low-slope roofing on the North ShoreRoofing services in Greater MontrealFlat and low-slope roofing projectsContact Alliance RoofingFree roofing estimateRoofing by city: Montreal, Laval, South Shore, North ShoreFlat roofs and TPO membranes in MontrealPrivacy and personal informationCookie policyRoofer in Ahuntsic-Cartierville: flat roofs and repairsRoofer in Anjou: flat roofs and repairsRoofer in Côte-des-Neiges–Notre-Dame-de-Grâce: flat roofs and repairsRoofer in Lachine: flat roofs and repairsRoofer in LaSalle: flat roofs and repairsRoofer in Le Plateau-Mont-Royal: flat 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roofs and repairsRoofer in Saint-Louis-de-Gonzague: flat roofs and repairsRoofer in Sainte-Martine: flat roofs and repairsRoofer in Saint-Jacques-le-Mineur: flat roofs and repairsRoofer in Saint-Édouard: flat roofs and repairsRoofer in Saint-Michel: flat roofs and repairsRoofer in Saint-Rémi: flat roofs and repairsRoofer in Sainte-Barbe: flat roofs and repairsRoofer in Sainte-Julie: flat roofs and repairsRoofer in Saint-Amable: flat roofs and repairsRoofer in Varennes: flat roofs and repairsRoofer in Verchères: flat roofs and repairsRoofer in Beloeil: flat roofs and repairsRoofer in Carignan: flat roofs and repairsRoofer in Chambly: flat roofs and repairsRoofer in McMasterville: flat roofs and repairsRoofer in Mont-Saint-Hilaire: flat roofs and repairsRoofer in Otterburn Park: flat roofs and repairsRoofer in Saint-Basile-le-Grand: flat roofs and repairsRoofer in Saint-Jean-Baptiste: flat roofs and repairsRoofer in Saint-Mathieu-de-Beloeil: flat roofs and repairsRoofer in Saint-Charles-sur-Richelieu: flat roofs and repairsRoofer in Saint-Marc-sur-Richelieu: flat roofs and repairsRoofer in Saint-Jean-sur-Richelieu: flat roofs and repairsRoofer in Mont-Saint-Grégoire: flat roofs and repairsRoofer in Saint-Blaise-sur-Richelieu: flat roofs and repairsRoofer in Sainte-Anne-de-Sabrevois: flat roofs and repairsRoofer in Saint-Alexandre: flat roofs and repairsRoofer in Richelieu: flat roofs and repairsRoofer in Saint-Mathias-sur-Richelieu: flat roofs and repairsRoofer in Marieville: flat roofs and repairsRoofer in Rougemont: flat roofs and repairsRoofer in Sainte-Madeleine: flat roofs and repairsRoofer in Sainte-Marie-Madeleine: flat roofs and repairsRoofer in Saint-Hyacinthe: flat roofs and repairsRoofer in Saint-Damase: flat roofs and repairsRoofer in La Présentation: flat roofs and repairsRoofer in Saint-Barnabé-Sud: flat roofs and repairsRoofer in Saint-Pie: flat roofs and repairsRoofer in Saint-Dominique: flat roofs and repairsTPO, modified bitumen or tar and gravel: how to choose?What does flat roof replacement cost? What to compare.Your roof is leaking: information that helps you act.Ponding on a flat roof: blocked drain or slope problem?White roofs in Montreal: what to check before work?Repair or replace your roof: five questions to help decide.Flat roof maintenance: a simple routine worth documenting.Condensation or a roof leak: why assessment matters.Condominium or commercial roof: prepare a clear project file.Shingles, metal or membrane: slope changes the decision.Roof leak or plumbing leak: prepare a useful diagnosisRoof inspection: what should the report contain?TPO welding: technology and the checks that matterEPDM, PVC and TPO: identify before repairingLiquid membranes and coatings: when restoration merits reviewAsphalt shingles: slope, ageing and repairMetal roofing: steel, aluminium, copper and details to compareRoof insulation: R-value, air barriers and vapour controlCathedral roofs, attics and inverted roofs: different assembliesRoof decking: OSB, plywood or steel deck?Flashing, parapets, drip edges and valleys: follow the water pathDrains, overflows and gutters: who checks what?Skylights, vents and equipment: coordinate roof connectionsSnow on the roof: signs to watch and planning a responseIce dams: address the buildup and understand the causeAfter a storm: organize emergency work and roof repairRoof maintenance: a simple record that is actually usefulCompare roofing quotes without overlooking exclusionsRoof warranties and insurance: documents to requestMontreal roof permits: prepare the right checksCondominium and shared roofs: organize a joint decisionCommercial roofing: plan work around operationsGreen, blue, terrace or solar roof: check feasibilityAltering a roof: structure, asbestos and site coordinationRoof slope and area: understand roofing measurementsRoof rain noise and vibration: prepare an acoustic assessmentRoof access and guardrails: plan maintenance during reroofingRoof insulation financial assistance: what to check before workGarage, addition and shed roofs: details that matterReroofing and recycling: request a practical waste planRoofing blog: advice, materials and maintenanceRoofing products: SOPREMA, IKO, BP, GAF and Premium FlashSOPRALENE FLAM 250 GR — SOPREMATorchflex™ TP-250-Cap — IKOEverGuard® TPO Smooth Membranes — GAFElastomeric - Pre-Flash™ Summum Drain 18"H — Premium FlashSOPRALENE FLAM 180 — SOPREMAIKO Innovi TPO 60-mil — IKOEverGuard® TPO Extreme Smooth Membranes — GAFELASTOPHENE FLAM — SOPREMAModiflex™ MP-180-Cap — IKOEverGuard® TPO Fleece‑Back 100, 115, and 135 Membranes — GAFSOPRAFIX BASE 635 — SOPREMAModiflex™ MP-HD-Cap — IKOEverGuard® SA TPO Self-Adhered Roof Membranes — GAFTPO - Pre-Flash™ Summum Drain 18"H — Premium FlashSOPRAPLY STICK TRAFFIC CAP — SOPREMAModiflex™ MF-95-SS-Base — IKOEverGuard® TPO Color Membrane — GAFElastomeric - Pre-Flash™ Drain 18"H — Premium FlashSOPRALENE FLAM 180 GR — SOPREMAModiflex™ MP-180-SS-Base — IKOEverGuard® TPO Extreme Fleece-back Membranes — GAFSOPRASTAR FLAM GR — SOPREMAModiflex™ MP-180-SS-Base (3.0 mm) — IKOEverGuard® TPO Fleece-back Membranes — GAFSOPRASTAR STICK GR — SOPREMAModiflex™ MP-HD-SS-Base — IKOTPO - Pre-Flash™ Drain 18"H - Base 24″ — Premium FlashSOPRAPLY STICK — SOPREMATorchflex™ TP-180-SF-Base (3.5 mm) — IKOSOPRAFLASH FLAM STICK — SOPREMAArmourbond™ 180 — IKOUniversal Pipe Flashing — Moulded TPO — Premium FlashSOPRAPLY FLAM STICK — SOPREMAArmourbond™ Flash — IKOUniversal Corner — Moulded TPO — Premium FlashSOPRAFLASH STICK — SOPREMAArmourbond™ Flash HD — IKO4.5" T-Joint Cover — Moulded TPO — Premium FlashSOPRAFLASH STICK DUO — SOPREMAArmourbond™ Flash Sand — IKOSOPRAPLY STICK DUO — SOPREMAArmourbond™ Flash Sand HD — IKOSOPRASTAR GR — SOPREMAArmourvent™ Base — IKOSOPRALENE 250 FR GR — SOPREMAModiflex™ MP-250-Cap — IKOELASTOPHENE 180 PS DG — SOPREMAModiflex™ MF-95-FS-Base — IKOSOPRAWALK — SOPREMAModiflex™ MP-180-FS-Base — IKOCOLPLY BASE 410 FLEX — SOPREMAModiflex™ MP-180-FS-Base (3.0 mm) — IKOElastomeric - Pre-Flash™ Summum Drain 12"H — Premium FlashCOLVENT BASE 840 — SOPREMAModiflex™ MP-HD-FS-Base — IKOELASTOPHENE 1500 — SOPREMATorchflex™ TP-250-Cap (5.0 mm) — IKOTPO - Pre-Flash™ Summum Drain 12"H — Premium FlashCOLPLY BASE 410 — SOPREMATorchflex™ TP-HD-Cap — IKOCOLVENT BASE 830 — SOPREMATorchflex™ TF-95-FF-Base — IKOSOPRAFIX BASE 630 — SOPREMATorchflex™ TF-95-FF-Base (2.2 mm) — IKOSOPRAFIX BASE 640 — SOPREMATorchflex™ TF-95-SF-Base — IKOSOPRAPLY BASE PLUS — SOPREMATorchflex™ TF-95-SF-Base (3.0 mm) — IKOTPO - Pre-Flash™ Laminated Liquid Sealant Pocket — Premium FlashSOPRALENE 180 PS 3.0 — SOPREMATorchflex™ TP-180-FF-Base — IKOSOPRALENE 180 SANDED — SOPREMATorchflex™ TP-180-SF-Base (3.0 mm) — IKOSOPRAPLY BASE 510 — SOPREMATorchflex™ TP-HD-FF-Base — IKOPre-Flash™ - Pre-Cut Elastomeric Gusset — Premium FlashCOLPLY TRAFFIC CAP FLEX — SOPREMAArmourCool™ Granular TP-HD — IKOSOPRALENE MAMMOUTH GR — SOPREMAArmourCool™ SA-HD-Cap — IKOCOLPLY TRAFFIC CAP — SOPREMAPrevENt™ ArmourCool™ Granular TP-HD-Cap — IKOSTARTER FLAM GR — SOPREMAFast-N-Stick™ 180-Base — IKOSOPRAPLY TRAFFIC CAP — SOPREMAFast-N-Stick™ HD-Base — IKOSOPRAPLY TRAFFIC CAP PLUS G/P 4.0 — SOPREMAPrevENt™ MP-HD-Cap — IKOSOPRASTAR GR FLEX — SOPREMAPrevENt™ MP-250-Cap — IKOTPO – Pre-Flash™ Laminated Scupper — Premium FlashELASTOPHENE SANDED — SOPREMAPrevENt™ TP-250-Cap — IKOTPO - Pre-Flash™ Split Pitch Pocket — Premium FlashELASTOPHENE PS — SOPREMAPrevENt™ TP-HD-Cap — IKOTPO - Pre-Flash™ Pitch Pocket — Premium FlashELASTOPHENE FLAM 2.2 — SOPREMAArmourStick™ HD-Base — IKOTPO – Pre-Flash™ AC 6″ (Connections Not Included) — Premium FlashELASTOPHENE 180 SANDED — SOPREMAIKO Innovi TPO 45-mil — IKOTPO – Pre-Flash™ AC 4″ (Connections Not Included) — Premium FlashELASTOPHENE 180 PS — SOPREMAIKO Innovi TPO 60-mil Minimum — IKOELASTOPHENE HS GR — SOPREMAIKO Innovi TPO 80-mil — IKOELASTOPHENE FLAM HS GR — SOPREMAIKO Cold Gold™ Field Adhesive — IKOELASTOPHENE FLAM HS — SOPREMAIKO Cold Gold™ Flashing Adhesive — IKOELASTOPHENE HS SANDED — SOPREMAPolybase™ 180 Mat — IKOElastomeric - Pre-Flash™ Drain 12"H — Premium FlashELASTOBASE — SOPREMAIKO S.A.M.™ Adhesive LVC — IKOSOPRAGLASS 100 — SOPREMAIKO S.A.M.™ Adhesive — IKOSOPRAPLY BASE 520 — SOPREMATorchTape™ 180-FF — Reinforcing Strips — IKOSOPRASTAR STICK FR GR — SOPREMAIKOTherm™ — IKOSOPRAPLY STICK TRAFFIC CAP FR — SOPREMAIKOTherm™ - 25 PSI — IKO2-1 SOPRASMART ISO HD — SOPREMAIKOTherm™ CoverShield™ — IKO2-1 SOPRASMART ROCK SANDED — SOPREMAIKOTherm™ III — IKO2-1 SOPRASMART ROCK — SOPREMAIKOTherm™ III 25 PSI — IKOSOPRAVAP’R — SOPREMASOPRALENE 180 SP 3,5 MM — SOPREMAELASTOPHENE SP 2.2 — SOPREMASOPRA-ISO SL — SOPREMASOPRA-ISO — SOPREMATPO - Pre-Flash™ Drain 12"H - Base 24″ — Premium Flash2-1 SOPRASMART ISO HD HP — SOPREMATPO - Pre-Flash™ Scupper — Premium FlashLASTOBOND STICK VP — SOPREMATPO - Pre-Flash™ U-Shaped Corner — Premium Flash2-1 SOPRASMART BOARD — SOPREMATPO - Pre-Flash™ L-Shaped Corner — Premium FlashSOPRASTOP — SOPREMATPO - Pre-Flash™ Split Mini Cone — Premium FlashALSAN FLASHING WINTER — SOPREMATPO - Pre-Flash™ Split Chimney Flashing — Premium FlashALSAN FLASHING — SOPREMATPO - Pre-Flash™ Chimney Flashing — Premium FlashDUOTACK — SOPREMA2-1 SOPRASMART ISO HD HP SANDED — SOPREMATPO - Pre-Flash™ Square Split Post Cover — Premium FlashSOPRA-ISO PLUS TRANSITION BOARD — SOPREMATPO - Pre-Flash™ Round Split Post Cover — Premium FlashLASTOBOND 195 — SOPREMATPO - Pre-Flash™ Liquid Sealant Pocket — Premium FlashLASTOBOND 240 — SOPREMATPO - Pre-Flash™ Insulated Vent — Premium FlashLASTOBOND SHIELD — SOPREMALASTOBOND SHIELD HT — SOPREMASOPRA-ISO TAPERED — SOPREMASOPRAGUARD TAPE — SOPREMASOPRAMASTIC — SOPREMACOLPLY FLASHING — SOPREMASOPRALAP SANDED — SOPREMASOPRALAP STICK — SOPREMASOPRALAP — SOPREMACOLPLY — SOPREMASOPRASPHALTE M — SOPREMASOPRASOLIN HD — SOPREMASOPRAJOINT — SOPREMASOPRA-ISO PLUS SL — SOPREMASOPRAROCK DD — SOPREMASOPRAROCK DD PLUS — SOPREMASOPRA-ISO PLUS — SOPREMASOPRA-XPS 35 — SOPREMASOPRA-XPS 35 DC — SOPREMA2-1 SOPRASMART ISO HD SANDED — SOPREMASOPRA-ISO PLUS HD — SOPREMA2-1 SOPRASMART BOARD SANDED — SOPREMASOPRA-ISO PLUS HINGED SUMP — SOPREMASOPRA-ISO PLUS PRE-CUT CRICKET FOR MECHANICAL UNITS — SOPREMASOPRA-ISO PLUS SUMP — SOPREMASOPRA-ISO PLUS TAPERED — SOPREMASOPRA-ISO PLUS HINGED PRE-CUT CRICKET — SOPREMASOPRA-ISO HINGED PRE-CUT CRICKET — SOPREMAELASTOCOL STICK H2O — SOPREMAELASTOCOL STICK — SOPREMAELASTOCOL STICK ZERO — SOPREMAELASTOCOL 350 — SOPREMAELASTOCOL 500 — SOPREMASOPRABOARD — SOPREMAALSAN SIL 402 — SOPREMAALSAN AC 180 — SOPREMAALSAN PU 410 — SOPREMAALSAN PU 310 — SOPREMASOPRAFLOW ALU NC Drains — SOPREMASOPRAFLOW ALU RF Drains — SOPREMASOPRAMASTIC BLOCKS — SOPREMASOPRAMASTIC PF — SOPREMABULK GRANULES — SOPREMASOPRAMASTIC SP2 — SOPREMASOPRAMASTIC ALU — SOPREMAPOLYFLEECE — SOPREMASOPRATACK FLASHING — SOPREMASOPRATACK FLASHING WINTER — SOPREMASOPRATACK WINTER — SOPREMACOLPLY EF FLASHING CEMENT — SOPREMACOLPLY EF — SOPREMASOPRASPHALTE OX TYPE II — SOPREMASOPRASPHALTE OX TYPE III — SOPREMASOPRATACK — SOPREMASOPRAFELT NO. 15 — SOPREMAELASTOCOL 190 — SOPREMAALSAN SIL 902 FLASHING — SOPREMASOPRALASTIC 123 — SOPREMASOPRALASTIC 124 ALU — SOPREMAType IV Fibreglass Felt — IKOType 2 Asphalt — IKOType 3 Asphalt — IKOIKO Easy-Melt™ — IKOModi-Melt™ SEBS — IKOHot Liquid Asphalt — BPAsphalt in KEGS — BPNo. 15 CSA Perforated Saturated Felt — RF404N — BPESGARD High Density — Uncoated, 1/2 in. — BPESGARD High Density — Coated on 1 Side, 1/2 in. — BPESGARD High Density — Coated on 6 Sides, 1/2 in. — BPESGARD High Strength — Coated on 1 Side, 1 in. — BPESGARD High Strength — Coated on 6 Sides, 1/2 in. — BPESGARD High Strength — Coated on 1 Side, 1/2 in. — BPMembranes and coverings — Roofing guidanceInsulation, ventilation and moisture — Roofing guidanceDecking, flashing and roof details — Roofing guidanceSnow, ice and severe weather — Roofing guidanceInspection and maintenance: evidence for decisions — Roofing guidanceBudget, warranties and project preparation — Roofing guidanceSpecialized roofs and alterations — Roofing guidanceRoofing questions: materials, maintenance and projects